Many people would disagree with you, I personally liked Pokemon Crystal a lot may be more than gold and silver since there was a cooler storyline and you could enjoy more the game also the feature of choosing between male and female made the game sell more, but thats what I think.
FireRed and LeafGreen were remakes, but they still are number 14 on the list of the best selling video games of all time. Doesn't sound too silly to me! In fact, when you think of it that way -- it's silly of them for not remaking Yellow!Plus, on the business side of things, its silly for any developer/publisher pair, including Game Freak and Nintendo, to put a significant amount of effort into remakes that generally sell less than new games when they could in fact be better off making said new games...remaking Crystal would amount to too much effort when Gold/Silver were essentially the same game with a few negligible features.
There was no OceanBlue or SparkYellow or any such nonsense... I don't really see them making [Name]Crystal. But that's just my guess.
Okay... don't shout at me if this has been mentioned before... but does anyone notice a connection to the aspects of the Kingdom Hearts universe to the naming of the new upcoming pokemon games?
I mean come ON! Heart Gold... Soul Silver
Heart -> Heartless
Soul -> UNBIRTH
and if this is thought of
Body -> Nobodies
so maybe the game will be called
Crystal Body... anyone even think of that...